feat(loadtest): sync add real 500-session capacity harness

internal/compat/tdesktop/config.go

@@ -1,6 +1,7 @@
 package tdesktop
 
 import (
+	"net/netip"
 	"time"
 
 	"github.com/iamxvbaba/td/tg"
@@ -13,18 +14,27 @@ import (
 // 字段值取 Telegram 常见默认；TDesktop 联调阶段按客户端实际需要微调
 // （记录于 docs/compatibility-matrix.md）。
 func BuildConfig(dc int, ip string, port int, now time.Time, publicBaseURL string) *tg.Config {
+	// TELESRV_ADVERTISE_IP is validated during config loading. Parse again here
+	// only to derive the wire ipv6 flag and to render IPv4-mapped addresses in
+	// their canonical form. Keeping the advertised route in help.getConfig is a
+	// protocol invariant: clients replace or persist this list for reconnects.
+	addr, err := netip.ParseAddr(ip)
+	if err == nil {
+		addr = addr.Unmap()
+		ip = addr.String()
+	}
 	meURLPrefix := links.NormalizeBaseURL(publicBaseURL) + "/"
 	config := &tg.Config{
 		Date:     int(now.Unix()),
 		Expires:  int(now.Add(time.Hour).Unix()),
 		TestMode: false,
 		ThisDC:   dc,
-		// 不下发 DCOptions：客户端（TDesktop patch / drklo fork）已写死 static DC
-		// 地址，空列表会让客户端保留它——drklo ConnectionsManager.cpp 的 processConfig
-		// 在 dc_options 为空时整段跳过 replaceAddresses/saveConfig，既不覆盖也不持久化。
-		// 服务端因此无需配置对外可达 IP，换网络/部署只改客户端写死地址即可。ip/port
-		// 参数暂留，供未来需要显式 advertise 时改回。
-		DCOptions:            nil,
+		DCOptions: []tg.DCOption{{
+			Ipv6:      addr.Is6(),
+			ID:        dc,
+			IPAddress: ip,
+			Port:      port,
+		}},
 		ChatSizeMax:          200,
 		MegagroupSizeMax:     200000,
 		ForwardedCountMax:    100,

internal/compat/tdesktop/config_test.go

@@ -18,3 +18,31 @@ func TestBuildConfigIncludesDefaultReaction(t *testing.T) {
 		t.Fatalf("reactions_default = %#v, want %q emoji", reaction, DefaultReactionEmoticon)
 	}
 }
+
+func TestBuildConfigAdvertisesCanonicalPrimaryDC(t *testing.T) {
+	tests := []struct {
+		name string
+		ip   string
+		want string
+		ipv6 bool
+	}{
+		{name: "ipv4", ip: "192.0.2.10", want: "192.0.2.10"},
+		{name: "ipv6", ip: "2001:0db8::1", want: "2001:db8::1", ipv6: true},
+		{name: "mapped ipv4", ip: "::ffff:192.0.2.10", want: "192.0.2.10"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			config := BuildConfig(2, tt.ip, 2398, time.Unix(1, 0), "https://telesrv.net")
+			if len(config.DCOptions) != 1 {
+				t.Fatalf("len(DCOptions) = %d, want 1", len(config.DCOptions))
+			}
+			option := config.DCOptions[0]
+			if option.ID != 2 || option.IPAddress != tt.want || option.Port != 2398 || option.Ipv6 != tt.ipv6 {
+				t.Fatalf("DCOptions[0] = %+v, want dc=2 ip=%q port=2398 ipv6=%v", option, tt.want, tt.ipv6)
+			}
+			if option.MediaOnly || option.CDN || option.TCPObfuscatedOnly || option.Static || option.ThisPortOnly {
+				t.Fatalf("DCOptions[0] has unexpected restrictive flags: %+v", option)
+			}
+		})
+	}
+}